your kids want to watch xmas yoga?...a pretty popular thing for families to do during the pandemic is yoga. there are loads of them but this is one of the most popular channels:
https://www.youtube.com/user/CosmicKidsYoga
she tells a story using using popular kids franchises (frozen, trolls, minecraft...) and as part of the story you do the "corresponding" yoga move. my kids love it. they wanted to watch the holiday episode: